If a process occurs resulting in a decrease in the system\'s potential energy wh

Question

If a process occurs resulting in a decrease in the system's potential energy while the system does work on the environment which of the following is true? The system's kinetic energy will decrease. There is not enough information given to determine whether a kinetic energy change is present. The system's kinetic energy will increase. The system's kinetic energy writ remain unaltered. A girl drops a basketball off of a dam and it falls freely. Which of the following is true? The ball's kinetic energy increases by equal amounts in equal distances. The ball's kinetic energy increases by equal amounts in equal time intervals.

Explanation / Answer

(1).The system's kinetic energy is increases.

Since from law of conservation of energy,the total mechanical energy is constant.

K.E of the system + P.E of the system = constant.

(2).The kinetic energy is increased by equal amounts in equal intervals of time.

Since kinetic energy K.E = (1/2) mv 2

We know from kinematic s equation v = u + at

Here u = initial velocity = 0

So, v = at   in free fall accleration a = g and it remains constant through out its path

So, K.E = (1/2) m(at) 2

           

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